GGT7 and hepatocellular carcinoma: Currently, according to related studies, changes in γ‐glutamyltransferase activity are associated with pretumor or toxicity status in the liver or kidney, and molecular mechanism studies have revealed that GGT7 affects tumor oxidative stress tolerance and promotes the epithelial‐mesenchymal transition (EMT) process in hepatocellular carcinoma cells by modulating glutathione metabolism, which may be promising biomarkers for the prediction of survival in HCC as well as new targets for intervention in tumor invasion and metastasis [15, 53, 54, 162].